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i would say almost always xen unless you buy more ram than you need. openvz memory management can reserve more than is necessary so you can find yourself with alot of apps especially apache/php/mysql if you don't set strict memory limits on it so it doesn't fail for going over memory.

Xen will has swap memory so it will slow performance if a program goes out of memory and not fail. If you know how your memory requirements and can handle load spikes than openvz for performance.

Either case for 500 sites... you should get a dedicated unless they are all static and don't require alot of php/mysql resources. Maybe another moderator can chime in on what you need.

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